I have developed a similar problem. I get a 403 error in my http://127.0.0.1~username/ , but I can see the http://127.0.0.1/ site. I notice In Netinfo Manager the title of the window is local@127.0.0.1-/ (that has changed) and selecting machines then localhost or broadcasthost, the 3 items in the lower window ip_address, name and serves are grayed out. I can not select them. I did play with this after winstonford offered a way to see a site inside a airport network.